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Current Modulation of Nanoconstriction Spin-Hall Nano-Oscillators
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2017 (English)In: IEEE Magnetics Letters, ISSN 1949-307X, E-ISSN 1949-3088, Vol. 8, article id 7858729Article in journal (Refereed) Published
Abstract [en]

A single nanoconstriction spin-Hall nano-oscillator (NC-SHNO) in out-of-plane fields is presented as a nonlinear amplitude and frequency modulator operated by radio-frequency (RF) current modulation. The current modulation was carried out in different NC-SHNO nonlinearity regimes corresponding to negative, zero, and positive values of df/dI in order to investigate the device response to an 80 MHz modulating current. Our study shows that current modulation of SHNOs can be quantitatively predicted by a nonlinear frequency and amplitude modulation (NFAM) model using the values of df/dI and d2f/dI2 extracted from the free-running frequency f versus current I profile. The NFAM model reproduces the asymmetric sideband amplitude as well as the red and blue shift of the frequency in excellent agreement with the experimental results. The ability to predict the modulation process is a necessary benchmark in designing SHNO modulators for future integrated microwave circuits.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc. , 2017. Vol. 8, article id 7858729
Keywords [en]
amplitude modulation, nonlinear frequency, Spin electronics, spin-Hall nano-oscillator, spintronics, Magnetoelectronics, Microwave circuits, Modulators, Current modulation, Free running frequency, Frequency modulators, Nano-oscillator, Radio frequency (rf) currents, Red and blue shifts, Spin electronic, Modulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-207429DOI: 10.1109/LMAG.2017.2671453ISI: 000399252100001Scopus ID: 2-s2.0-85017384088OAI: oai:DiVA.org:kth-207429DiVA, id: diva2:1098280
Note

Funding details: ERC, European Research Council; Funding text: This work was supported in part by the Swedish Foundation for Strategic Research, in part by the Swedish Research Council, in part by the Knut and Alice Wallenberg Foundation and in part by the European Research Council under the European Community's Seventh Framework Programme (FP/2007-2013)/ERC under Grant 307144"MUSTANG."

QC 20170523

Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-02Bibliographically approved

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Åkerman, Johan

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